const beforeUpload = (file: RcFile, _: RcFile[]) => { return new Promise((resolve, reject) => { const isSizeValid = file.size / 1024 / 1024 < 1; if (!isSizeValid) { message.error('只允许上传大小为1MB以内的图片'); reject(new Error('文件太大')); } else { resolve(file); } }); };